nftables(role): introduce role for deploying nftables

roles/nftables/README.md

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+# Role `nftables`
+
+Deploys nftables.
+
+## Support Distributions
+
+Should work on Debian-based distributions.
+
+## Required Arguments
+
+- `nftables__config`: nftables configuration to deploy.

roles/nftables/handlers/main.yaml

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+- name: Restart nftables service
+  ansible.builtin.systemd_service:
+    name: nftables
+    state: restarted
+  become: true

roles/nftables/meta/argument_specs.yaml

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+argument_specs:
+  main:
+    options:
+      nftables__config:
+        type: str
+        required: true

roles/nftables/tasks/main.yaml

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+- name: ensure nftables is installed
+  ansible.builtin.apt:
+    name: nftables
+    state: present
+  become: true
+
+- name: deploy nftables configuration
+  ansible.builtin.copy:
+    content: "{{ nftables__config }}"
+    dest: "/etc/nftables.conf"
+    mode: "0644"
+    owner: root
+    group: root
+  become: true
+  notify: Restart nftables service